Jf zeromq display (#644)

* modified ZmqSocket to expose the SO_RCVBUF and SO_SENDBUF parameters. Modified DataStreamer.cpp to change the SENDBUF to 1MB when HWL is <10. Modified Datastreamer.cpp so that when HWL is changed, socket is unbind/rebind. Added rebind to ZmqSocket.cpp.
Changed slot UpdatePlot() in qdrawplot.h from privat tto public, added plot->UpdatePlot() after every axis range change, so the plots are updated immediatly and not at the next image.
Added onlinedisp_zmq program which connects to the receiver ZMQ port and show images and histos. Compiled against  ROOT 6.22/02. Added examples files.

* added setbuffer size also for gui, moved hardcoded values to a macro, removed unnecessary return of ok or success, added actual zmq exception message to could not create sockets error

* zmq: changing buffer size done within hwm

---------

Co-authored-by: mozzanica <l_mozzanica@mpc2012.psi.ch>
Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>

slsDetectorCalibration/dataStructures/jungfrauModuleData.h

@@ -40,20 +40,31 @@ class jungfrauModuleData : public slsDetectorData<uint16_t> {
        out by a module i.e. using the slsReceiver (160x160 pixels, 40 packets
        1286 large etc.) \param c crosstalk parameter for the output buffer
 
-    */
+   */
+#ifndef ZMQ
+#define off sizeof(jf_header)
+#endif
+#ifdef ZMQ
+#define off 0
+#endif
+
+
     jungfrauModuleData()
         : slsDetectorData<uint16_t>(1024, 512,
-                                    1024* 512 * 2 + sizeof(jf_header)) {
-
+                                    1024* 512 * 2 + off) {
+  
         for (int ix = 0; ix < 1024; ix++) {
             for (int iy = 0; iy < 512; iy++) {
-                dataMap[iy][ix] = sizeof(jf_header) + (1024 * iy + ix) * 2;
+                dataMap[iy][ix] = off + (1024 * iy + ix) * 2;
 #ifdef HIGHZ
                 dataMask[iy][ix] = 0x3fff;
 #endif
             }
         }
 
+
+
+
         iframe = 0;
         //  cout << "data struct created" << endl;
     };